Chair base



R. K. DAWSON CHAIR BASE Jan. 19 ,1926.V l 1,570,436

Filed April '7, 1924.

- vnf/vree a subject of the Kingof Great Britain,- resfid# n' Y chair seat relativelyto"thespiiidle, fand[also f Y have heretofore been'subject'are.- eliminated,

. which are secure'd'to the 4chair seat, and 'the' Patented Jen. 19, 19.26. y l j UNIT E'Df i y. ROBERTKf-.Devsomr AKRN, New .Y CHAIRzBnsEQG Application nlinnmiij s'll ivo. 7045.215. .l n

T0 @Zlwwmitmae/www1?` l intermediate poraoasof whicime'k depressed Beit known that I, ROBERT'VK; DAwsoNlgr I Y i 0f the Chair Seat.; The wel-angie bare cafs, Sut'bly, @D Ilcted, `for' example', by fmean's ing at Akron', infthey countyi'offErie and ,I l l l of'a plate'v Dgf which, in ithe'con's'truction f State of New York, have invented'fa new and useful Improvement in Chair Bases, off' which the following is 'a specification. This invention relates'to |chair irons anelliv more particularly to those parts -of-` chair irons which support Vthe chair seat'from the upper 'end of the usual .spindle or' scre'wj stem'. The objects offthisV inventionare' to' improve and simplify the construction ofchair,y irons and'to reduce' th'eweight"th'ereoi'g:e als'o` to provide' a vconstruction otthi'sfkindiii y which the usual squeaks t which'ichairir'ons if or'horizontal lflanges' 'offthe angle bars or` legs yof which, inthe construction' sho-wn, l extend [ins-ide 'of thefdown-wardly extending/- flanges V of j thev l.angle bars "G1 or"v the' oliair;

also to'proyide an'yimprovedjspring con-v ory flang'e"s'e2'ten`ding fdownwardly, and. Vis"l so as toiextend slightlybelow'the lower face;`

showmj is*'securedto"the'fintermediatepor'- A. itions `oftl1e` angle' bars by means lof'rivets" d ci'connecting tleplate D with the upper The spiderv may be supported Jfromth'e chair'spindleyin, any suitable mannenforj. yexample means of'ia'UI-'shap'ed bracket `4 member' E, the upwardlyfetendingxtlang'efs f V v spider'.` Af smaller` U-shaped membervF fis i 'arranged `within the inember with its legs 2 struction for opposing ,'thefswingilng;,ofgthe securedthereto `by' means-of rivets. f fp assing'x seat'about theuppe'r end ofthe`spindle';, thro'ugh' the flanges-or legs. ofthe/two U34 also vto providemprovedyneans,foriadgust vvshaped*'members(vk These-two,membersthus 5 connected are provided'in theirfhorizonta1'-..[

ing the tension 'of' "the springs',"whiclilhold f the chair seatnormallyin their'ho'riZontal Position; alsoiit@ provide; improved' 'means vfor limiting xthe tilting movement, off@A the portion-'s' with]r alined holes throughv 'which theredu'ced'upper end b of the spindlejB Athe shoulder formed .at thejunction of the to improve the'construction' of'dvic'es of' this kind-inl the other respectsghereinafter specified. i

In they accompany-ing drawings z-v-` of [the "chair`r spindle Bi, and the upperl'eridf Fig.' 1 is a top plan View of a chairiron4 embodyingthis invention. l, f A Y Fig. 2 is a longitudinal, central,V sectional side elevation' thereof showingy `a` chair seatV mounted thereon. I'

Fig.` 3 is a transverse ysectional elevation thereof'on' line Figgl. I Y

Fig.. 4 is a fragmentary: sectional plan* view' thereof-,on an' enlarged scale on line"` 4-4,Fig. 2.

face of, thejinvertedfllfshaped member: FL

member i'sgrigidly "secured-to, the spindle to theidownwardly extending ,flanges of 'the bar-s2 C ofthe-spider by means of a pivot' bolt G. Other connecting means v between the.; chair spindle and yspider inavfbe used l if deslef f Figf5 is a fragmentary',longitudinalsec# i 1 Inchair iro1is',as h'jef'retoforemaderitfwasv tional elevation thereof on 'lineb-, Fig.'` 3. 'customary to use oneor more coil,springs'z Fig. 6 isa ragme'ntarysec'tion' thereof'on' `which werefeitliersubjected to' compression line 6-6,"Fig.l7. Y f Y or tension when the chair'seat wastilted or Fig. 7 is affra'gmentary transverse sec` tional Lelevation 'thereofon line 7`-7,' Figg A,'Fig. '2 represents the 'usualseat' orfay chair and Bfthe spindle o rupri'ghtI adjust'- ing screw, the lowerend of 'which maybe swivelled in the usual chairfbase,'n'ot 'shown'. The chair seatis supported by means ofthe' Y usual spider," which in the y constructiontoobtain the necessari-y leverage to resist the shown, comprises a pair of 'bars C, of'ang'le-fY tiltingk'of the chair'seatfwhich necessitated shapedf cross section, the oppositeendsl'off a cumbersome and-heavy construction; and

requiredy 4a follower block or member which had yto be J'guidedin its lengthwise movement" `on`llthe chair "iron".v lxhisv construction has 'the' disadvantage, inthe liirst place, that' the tension'r orjcompressionfsprings 'must' be ar- Bj The lupwardlyextendinglegsof-th'e l U-'shaped 'member E arefpivo'tally connected malinteso-Shaped member El engageinig; y

reduce'd'iportion; ZJ w'ithfthe largerportionFV- ofj'tlie reduced'portion yof ythe spindlepis'. f 7 l rivetedv or'jturnedlj over against.V the@V upper` i swung ,rearwardly, and springs of thgisfkind y i rangedfat a' dista-ii'ce'frointlie pivot in order 110,

in the secpndfplacefthe use or.y

lock engaging one end of the spring and movable relatively to the chair iron develops squeaks or other objectionable noises which are extremely diliicult to eliminate.

In order to overcome these objections, one or more torsion springs H is provided in the construction illustrated, having intermediate looped portions L which are preferably arranged about the pivot bolt G. The rear ends h of the springs in the construction shown are arranged to press upwardly against the seat spider in rear of the pivot thereof, and the front lends 7b2 of the springs extend forwardly and are adapted to be engaged by some means for adjusting the tension of the springs. In the construction shown for this purpose, the front ends of the springs are curved downwardly to engage l a yoke member I which is adjustable to vary the force exerted by the springs upon the spider of the chair. Any suitable means may be employed for adjusting the yoke member, the means shown including a bolt Kvwhich has a head lo, and which extends through a hole in the horizontal portion of the U-shaped member E and is bent so that the front end of the bolt extends forwardly in a substantially horizontal direction. The front end of the bolt extends between the springs and through a hole in the yoke, and an adjusting nut L is secured on the front end of the bolt and is adapted to bear against the yoke I to move the same forwardly or rearwardly to vary the tension or force exerted by the springs. j

The rear ends h of the spring may be held in operative relation to the chair spider in any suitable or desired manner. In the construction shown for this purpose, the two rivets al of therspider are provided with heads at the lower ends of these rivets which have depressions or longitudinally extending notches M therein, as clearly indicated in Figs. 3, 6 and 7 into which the forwardly extending ends L of the springs may seat, and which holds these ends of the springs in their proper relation to the chair spider.

The springs H tend to swing the seat A forwardly, and consequently stops are provided for limiting the swinging of the seat about its pivot, both forwardly due to the action of the springs, and rearwardly against the action ofthe springs. In the particular construction shown lfor this purpose, the upwardly extending legs of the U-shaped spider supporting member E are provided at their upper ends with stop faces or edges N ada ted to engage the connecting plate D of tie spider when the seat is swung to substantially horizontal position by the springs, as indicated in Fig. 2. The rearward swinging of the seat A about the pivot G is limited by means of edges or faces O, also formed on the upper ends of the upwardly extending legs of the U-shaped members E and arranged at an inclination to the faces N and adapted to engage the rear portions of the connecting plate. D when the seat is swung to the limit of its rearward movement against the action of the springs H. ByV means of this construction no additional expense is involved to provide the stop for limiting the movement of the chair seat, since the spider supporting member E itself forms the stops. The upper ends of the U-shaped member E in addition to acting as stops, as described, also preferably bear against the sides of the downwardly extending flanges of the angleshaped member C of the spider to hold the spider in correct relation to the chair spindle B.

The chair iron described has the advantage of being unusually light in construction without any sacrifice of strength. The two springs H disclosed in the drawings are of about one-third of the weight of the usual coil springs employed for the same purpose in constructions heretofore used, and furthermore, it has been Ifound that by provid-` ing a coil spring of the kind shown, in which the coil itself is subjected to torsion, there is less chance for crystallization, and consequently the springs last longer. It will also be noted that there is no relative movement or sliding movement between the parts -of the springs engaging the spider when the chair seat is swung rearwardly, so that there is no tendency of the springs to squeak or to yield unevenly due to friction interposed between the springs and the chair spider.

I claim as my invention r l. The combination with a chair spider' and a chair spindle, of a member mounted on the upper end of said spindle and on which said spider is pivotally supported, a spring engaging said member and said spider and having a coil which is subjected to torsion, one end of said spring extending rearwardly from said coil and bearing upwardly against said spider to resist the rearward swinging of the same and the other end of the spring extending forwardly from said coil, and means engaging said other end of said spring and said member for varying the tension of said spring.

2. The combination of a. chair spider including a pair of flanged members having substantially horizontal flanges and substantially upright ianges, a supporting member for said spider having upwardly extending parts pivoted on said upright flanges, a spring for opposing the rearward swinging of said spider about said supporting member, a substantially horizontal stop face on said upwardly extending parts of said supporting member which is adapted to cooperate with a horizontally extending flange of said spider to limit the forward swinging moiement of said spider, and a rearwardly zontally extendingflange ofisaid: spiderifor.. limiting ther rearwardA swingingI movement v inclined v stop face on said 4upwardly rextend-L ing parts which is adaptedto engage a horiof'saidspider.. Y Y 3.- Thecombination of alcliair spider including a pair offlanged members, 'which' have substantiallyY downwardly! extending, flanges-'and horizontally-:1 extendingv flanges,

having aa spider supporting member pair of upwardly extending arms arranged in proximity to said downwardly extending llangesto enable said flanges to hold said spider ysupporting member against lateral displacement relatively to said spider and'y pivotally connected therewith, a spring for opposing the rearward swinging of said spi.

der about said supporting member, andsubstantially horizontal and rearwardly inclined faces on the upper ends of said upwardly extending parts of said supporting member which are adapted to cooperate with the horizontally extending llanges of said flanged members to limit the forward and rearward swinging movements respectively of said spider about said pivot.

4. The combination of a chair spider having` a pair of flanged members provided withy substantially horizontal flanges and ,downwardly extending flanges, a substantially Y horizontal connecting plate securedto ysaid v connecting device and to extend into saidhorizontal flanges, a spider supporting member including upwardly extending I parts which are pivoted on the downwardly e x. tending flanges of said spider member, ay

means for pivotally supporting said spider,

and a torsion spring connecting said means and said spider and adapted to bear on said groove to hold saidspring in correct vrelation to said chair. v Y f 67A chair including two parts, 4,one of which is adapted to swing relatively to the other part, a torsion spring connecting said parts for opposing the swinging of one of said parts in one direction, and a rivet used I in the construction of one of said parts and which has a head provided in its end with a depression forming a seat for aV part ofsaid spring to hold said spring in correct rela-V tion to said parts.

7 The combination of a chair spider'having two bars each provided with a substansaid spring,

tiallyhorizontal flange and with a; downwardly extending, flange, ai plate. connecting said horizontal flanges', rivets extending;l

through said-plateiand saidilanges forl secur- `ingsaid plate to saidiflanges, ay spider supporting member to which said spider is piv-A otallysecured, atorsion spring, therear end ofj'which is adapted to engage saidl spider andfis held in operative relation to said spider byonev. ofV said rivets,r-and meansf'fo'r connecting .the f other -end of saidl i torsion` springt'osaid spider supporting member.

8. The combination of a chair spider having two bars provided with substantially horizontal flanges `and with downwardly ex tending flanges, a plate connecting the horizontal ,flanges of said bars, rivetsy securing saidv plate to said flanges, the lower heads of said rivets being provided with transverse depressions, a spider supporting member on which, saidv spider is pivoted, and spring bars for'opposing the rearward swinging of said spider, ythe rear ends of saidbars entering into the depressions in said rivets for secur-l ing said-bars spider.

9. The combination. of a1y chair spider, arf

spider' supporting member of substantially U-shaped cross section having upwardly extending legs to which said spider is pivoted,

a torsionV spring, one endl of'which engages,

said-spider andthe other end of which extends forwardly of saidA supporting member and oppositely to said first mentioned end of` tom of said U-shaped member and bent, forwardly therefrom so that the front end of ,said boltV extends substantially at riht angles to the other end vof said spring, an a nut arranged on saidbolt and adapted to engage said other end of said lspring for adjusting the tensionvthereof.

l0. In a chair iron the'combination of a vspider consisting of a pair of` bars of angle shaped cross section the flanges .of which are arranged substantially horizontally and vertically, a connecting plate secured to the horizontally arranged flanges of said angle `bars,va spider supporting member offsubstantially U-shape, a pivot connecting the upper ends of said U-shaped member .to the downwardly extending flanges of said angle bars, a pair of torsion springs having coils arranged about said pivot, one end of each of said vsprings engaging said spider and the other end of each spring extending for- Vwardly of said U-sha-ped member, a threaded vbolt secured to said U-shaped member and extending forwardly therefrom, and a nut on said bolt engaging the forwardly extending ends of said springs and adapted to vary A the tension thereof.

1l. In a'chair iron the combination of ay spider'consisting of a pair of bars of angleshaped vcross section'having their flanges arinoperative relation to said *90,7

a bolt connected'with theV bot- 100 ranged substantially horizontally andvertieally, a connecting plate secured to said horizontally arranged flanges of said angle bars, a spider supporting member of substantially U-shape, a pvot connecting the upper ends of said U-shaped member with the downwardly extending flanges of said angle bars, a pair of torsion springs having coils arranged about said pivot, one end of each of said springs engaging said spider, a threaded bolt secured to said U-shaped meinber and extending forwardly therefrom, a

nut on said bolt engaging the. other ends of said springs and adapted to Vary the tension thereof, and a pair of rivets connecting said angle bars and said connecting plate and having transverse slots formed in the lower spaces thereof, the ends of said springs which engage the spider being adapted to enter into said slotted ends to position the ends of the springs relatively to said chair iron.

ROBERT K. DAWSON. 

